feat: add SpecDialog component for editing spec frontmatter

- Implement SpecDialog for managing spec details including title, read mode, priority, and keywords.
- Add validation and keyword management functionality.
- Integrate SpecDialog into SpecsSettingsPage for editing specs.

feat: create index file for specs components

- Export SpecCard, SpecDialog, and related types from a new index file for better organization.

feat: implement SpecsSettingsPage for managing specs and hooks

- Create main settings page with tabs for Project Specs, Personal Specs, Hooks, Injection, and Settings.
- Integrate SpecDialog and HookDialog for editing specs and hooks.
- Add search functionality and mock data for specs and hooks.

feat: add spec management API routes

- Implement API endpoints for listing specs, getting spec details, updating frontmatter, rebuilding indices, and initializing the spec system.
- Handle errors and responses appropriately for each endpoint.

ccw/frontend/src/pages/IssueHubPage.tsx

@@ -17,9 +17,8 @@ import {
 import { IssueHubHeader } from '@/components/issue/hub/IssueHubHeader';
 import { IssueHubTabs, type IssueTab } from '@/components/issue/hub/IssueHubTabs';
 
-const VALID_TABS: IssueTab[] = ['issues', 'board', 'queue', 'discovery'];
+const VALID_TABS: IssueTab[] = ['issues', 'queue', 'discovery'];
 import { IssuesPanel } from '@/components/issue/hub/IssuesPanel';
-import { IssueBoardPanel } from '@/components/issue/hub/IssueBoardPanel';
 import { QueuePanel } from '@/components/issue/hub/QueuePanel';
 import { DiscoveryPanel } from '@/components/issue/hub/DiscoveryPanel';
 // ExecutionPanel hidden - import { ExecutionPanel } from '@/components/issue/hub/ExecutionPanel';
@@ -366,7 +365,6 @@ export function IssueHubPage() {
   const renderActionButtons = () => {
     switch (currentTab) {
       case 'issues':
-      case 'board':
         return (
           <>
             <Button variant="outline" onClick={handleIssuesRefresh} disabled={isFetchingIssues}>
@@ -437,7 +435,6 @@ export function IssueHubPage() {
 
       <IssueHubTabs currentTab={currentTab} onTabChange={setCurrentTab} />
       {currentTab === 'issues' && <IssuesPanel onCreateIssue={() => setIsNewIssueOpen(true)} />}
-      {currentTab === 'board' && <IssueBoardPanel />}
       {currentTab === 'queue' && <QueuePanel />}
       {currentTab === 'discovery' && <DiscoveryPanel />}